I am simulating a room with a raised platform which has an air inlet on the platform. the platform is an internal face. i created the geometry with gmsh and converted it to OpenFoam using gmsh2ToFoam . Since the internal faces are not recognized as boundary patches, I did the following:

1) modified the boundary file,
2) modified all the entries in 0 folder.
3) ran createBaffles.
4) moved the mesh from '0' folder to 'constant' folder

Now the required patch is showing in my boundary file. i applied the BC and on running the simulation, it is showing the following error:

I am facing a similar problem...
I want to calculate the flux through an internal face inside my mesh. In principal I did the same steps as Robin to transform the faceZone into a patch...
I think I will manage to calculate the flux through that patch if only I would know which type I have to assign to this patch. This is where I am stuck. Is there something like a transmissive patch type which does not influence the flow? Are there other ideas how to solve this problem?